\documentclass[12pt]{article}
\usepackage{fullpage,amsmath,amsfonts}

\begin{document}

\title{Partial Differential Equations}
\author{Homework 1}
\date{due September 17, 2009}
\maketitle

\begin{enumerate}

\item Write out a complete, self-contained proof of the weak Leibniz
  formula.  (The proof is basically given in Evans, but some details
  regarding the indexing of the sums and the addition theorem for the
  binomial coefficients for multi-indices are missing.)

\item Evans, p.\ 290, Problem 2

\item Evans, p.\ 290, Problem 7

\item \emph{Optional problem, strongly recommended for graduate
    students, no credit:}  Evans, p.\ 290, Problem 5

\end{enumerate}


\end{document}

